With a Linux decoder such as Octagon (with Openatv e Kodi) you can see your TV on your smartphone. Provided that you have Kodi both on decoder and on smartphone.
- Both decoder and smartphone should be under the same network (such as samba).
- Install on your smartphone Kodi app,
- in Kodi install a PVR client such as enigma2,
- configure the correct IP of your decoder (something like 192.168.1.166) and your decoder Kodi credentials.
- You should be able to see your TV, as in the following image
